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20. Tritonidea (Cantharus) fuscozonatus, n. sp. Plate XXX. fig. 5.
Shell ovato-fusiform, solid, spirally ridged and axially broadly costate. Sculpture consisting of regular spiral liræ of subequal strength, the interstices with 1 or several fine spiral threads, the liræ more prominent and further apart on the base; axial ornamentation formed by rather distant, elevated, and broadly rounded axial costæ, about 15 on a whorl, the spirls passing over them; they are getting obsolete on the base. Colur fulvous, the spiral riblets purple, sometimes a purple band above the suture and a second below the periphery of the body-whorl are present, also longitudinal streaks of light-brown; aperture whitish within. Spire conical, turreted, of the same height as the aperture with canal; outlines straight. Protoconch conical,
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axially striate. Whorls 6 to 7, the last high, concave on the shoulder, convex below it; base contracted. Suture not deep, undulating. Aperture somewhat oblique, narrowly channelled above, with an oblique narrowly open and slightly recurved canal below, its base notched. Outer lip thick, with a distinct varix outside, callous and denticulate within. Columella vertical, concave, with transverse ridges over the whole length; inner lip narrow, spreading over the concave parietal wall, which bears a tubercle above; narrowed below to a point. Some specimens have a distinct depression between the fasciole and the edge of the canal. Operculum unknown.
Diameter, 14 mm.; height, 26 mm. Type specimen.
Type in the Dominion Museum, Wellington.
Hab.—East Cape Lighthouse, type; Foveaux Strait.
Remarks.—This species is very variable in size; my largest specimen, of 7 whorls, measures 17 mm. by 32 mm., the smallest also of 7 whorls, 10.5 mm. by 21 mm., but numerous intermediate forms occur.